Had a similar "clicking" sound on left and right lock. Only able to hear it in quiet carpark. Asked dealer about it when it was in to get solenoid replaced - tech's "couldn't hear it". Took the Master tech to a nearby car park - he heard it.
He had no idea what it was. The SA guessed at it being "pulley related" due to it only happening under load with an amount of lock. No idea whether that's right or wrong.
It's started to get louder (in my mind, anyway), so back she goes again.
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